addnode.cpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25// Portions of code courtesy of Clifford Click 26 27#include "incls/_precompiled.incl" 28#include "incls/_addnode.cpp.incl" 29 30#define MAXFLOAT ((float)3.40282346638528860e+38) 31 32// Classic Add functionality. This covers all the usual 'add' behaviors for 33// an algebraic ring. Add-integer, add-float, add-double, and binary-or are 34// all inherited from this class. The various identity values are supplied 35// by virtual functions. 36 37 38//============================================================================= 39//------------------------------hash------------------------------------------- 40// Hash function over AddNodes. Needs to be commutative; i.e., I swap 41// (commute) inputs to AddNodes willy-nilly so the hash function must return 42// the same value in the presence of edge swapping. 43uint AddNode::hash() const { 44 return (uintptr_t)in(1) + (uintptr_t)in(2) + Opcode(); 45} 46 47//------------------------------Identity--------------------------------------- 48// If either input is a constant 0, return the other input. 49Node *AddNode::Identity( PhaseTransform *phase ) { 50 const Type *zero = add_id(); // The additive identity 51 if( phase->type( in(1) )->higher_equal( zero ) ) return in(2); 52 if( phase->type( in(2) )->higher_equal( zero ) ) return in(1); 53 return this; 54} 55 56//------------------------------commute---------------------------------------- 57// Commute operands to move loads and constants to the right. 58static bool commute( Node *add, int con_left, int con_right ) { 59 Node *in1 = add->in(1); 60 Node *in2 = add->in(2); 61 62 // Convert "1+x" into "x+1". 63 // Right is a constant; leave it 64 if( con_right ) return false; 65 // Left is a constant; move it right. 66 if( con_left ) { 67 add->swap_edges(1, 2); 68 return true; 69 } 70 71 // Convert "Load+x" into "x+Load". 72 // Now check for loads 73 if (in2->is_Load()) { 74 if (!in1->is_Load()) { 75 // already x+Load to return 76 return false; 77 } 78 // both are loads, so fall through to sort inputs by idx 79 } else if( in1->is_Load() ) { 80 // Left is a Load and Right is not; move it right. 81 add->swap_edges(1, 2); 82 return true; 83 } 84 85 PhiNode *phi; 86 // Check for tight loop increments: Loop-phi of Add of loop-phi 87 if( in1->is_Phi() && (phi = in1->as_Phi()) && !phi->is_copy() && phi->region()->is_Loop() && phi->in(2)==add) 88 return false; 89 if( in2->is_Phi() && (phi = in2->as_Phi()) && !phi->is_copy() && phi->region()->is_Loop() && phi->in(2)==add){ 90 add->swap_edges(1, 2); 91 return true; 92 } 93 94 // Otherwise, sort inputs (commutativity) to help value numbering. 95 if( in1->_idx > in2->_idx ) { 96 add->swap_edges(1, 2); 97 return true; 98 } 99 return false; 100} 101 102//------------------------------Idealize--------------------------------------- 103// If we get here, we assume we are associative! 104Node *AddNode::Ideal(PhaseGVN *phase, bool can_reshape) { 105 const Type *t1 = phase->type( in(1) ); 106 const Type *t2 = phase->type( in(2) ); 107 int con_left = t1->singleton(); 108 int con_right = t2->singleton(); 109 110 // Check for commutative operation desired 111 if( commute(this,con_left,con_right) ) return this; 112 113 AddNode *progress = NULL; // Progress flag 114 115 // Convert "(x+1)+2" into "x+(1+2)". If the right input is a 116 // constant, and the left input is an add of a constant, flatten the 117 // expression tree. 118 Node *add1 = in(1); 119 Node *add2 = in(2); 120 int add1_op = add1->Opcode(); 121 int this_op = Opcode(); 122 if( con_right && t2 != Type::TOP && // Right input is a constant? 123 add1_op == this_op ) { // Left input is an Add? 124 125 // Type of left _in right input 126 const Type *t12 = phase->type( add1->in(2) ); 127 if( t12->singleton() && t12 != Type::TOP ) { // Left input is an add of a constant? 128 // Check for rare case of closed data cycle which can happen inside 129 // unreachable loops. In these cases the computation is undefined. 130#ifdef ASSERT 131 Node *add11 = add1->in(1); 132 int add11_op = add11->Opcode(); 133 if( (add1 == add1->in(1)) 134 || (add11_op == this_op && add11->in(1) == add1) ) { 135 assert(false, "dead loop in AddNode::Ideal"); 136 } 137#endif 138 // The Add of the flattened expression 139 Node *x1 = add1->in(1); 140 Node *x2 = phase->makecon( add1->as_Add()->add_ring( t2, t12 )); 141 PhaseIterGVN *igvn = phase->is_IterGVN(); 142 if( igvn ) { 143 set_req_X(2,x2,igvn); 144 set_req_X(1,x1,igvn); 145 } else { 146 set_req(2,x2); 147 set_req(1,x1); 148 } 149 progress = this; // Made progress 150 add1 = in(1); 151 add1_op = add1->Opcode(); 152 } 153 } 154 155 // Convert "(x+1)+y" into "(x+y)+1". Push constants down the expression tree. 156 if( add1_op == this_op && !con_right ) { 157 Node *a12 = add1->in(2); 158 const Type *t12 = phase->type( a12 ); 159 if( t12->singleton() && t12 != Type::TOP && (add1 != add1->in(1)) && 160 !(add1->in(1)->is_Phi() && add1->in(1)->as_Phi()->is_tripcount()) ) { 161 assert(add1->in(1) != this, "dead loop in AddNode::Ideal"); 162 add2 = add1->clone(); 163 add2->set_req(2, in(2)); 164 add2 = phase->transform(add2); 165 set_req(1, add2); 166 set_req(2, a12); 167 progress = this; 168 add2 = a12; 169 } 170 } 171 172 // Convert "x+(y+1)" into "(x+y)+1". Push constants down the expression tree. 173 int add2_op = add2->Opcode(); 174 if( add2_op == this_op && !con_left ) { 175 Node *a22 = add2->in(2); 176 const Type *t22 = phase->type( a22 ); 177 if( t22->singleton() && t22 != Type::TOP && (add2 != add2->in(1)) && 178 !(add2->in(1)->is_Phi() && add2->in(1)->as_Phi()->is_tripcount()) ) { 179 assert(add2->in(1) != this, "dead loop in AddNode::Ideal"); 180 Node *addx = add2->clone(); 181 addx->set_req(1, in(1)); 182 addx->set_req(2, add2->in(1)); 183 addx = phase->transform(addx); 184 set_req(1, addx); 185 set_req(2, a22); 186 progress = this; 187 } 188 } 189 190 return progress; 191} 192 193//------------------------------Value----------------------------------------- 194// An add node sums it's two _in. If one input is an RSD, we must mixin 195// the other input's symbols. 196const Type *AddNode::Value( PhaseTransform *phase ) const { 197 // Either input is TOP ==> the result is TOP 198 const Type *t1 = phase->type( in(1) ); 199 const Type *t2 = phase->type( in(2) ); 200 if( t1 == Type::TOP ) return Type::TOP; 201 if( t2 == Type::TOP ) return Type::TOP; 202 203 // Either input is BOTTOM ==> the result is the local BOTTOM 204 const Type *bot = bottom_type(); 205 if( (t1 == bot) || (t2 == bot) || 206 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) 207 return bot; 208 209 // Check for an addition involving the additive identity 210 const Type *tadd = add_of_identity( t1, t2 ); 211 if( tadd ) return tadd; 212 213 return add_ring(t1,t2); // Local flavor of type addition 214} 215 216//------------------------------add_identity----------------------------------- 217// Check for addition of the identity 218const Type *AddNode::add_of_identity( const Type *t1, const Type *t2 ) const { 219 const Type *zero = add_id(); // The additive identity 220 if( t1->higher_equal( zero ) ) return t2; 221 if( t2->higher_equal( zero ) ) return t1; 222 223 return NULL; 224} 225 226 227//============================================================================= 228//------------------------------Idealize--------------------------------------- 229Node *AddINode::Ideal(PhaseGVN *phase, bool can_reshape) { 230 Node* in1 = in(1); 231 Node* in2 = in(2); 232 int op1 = in1->Opcode(); 233 int op2 = in2->Opcode(); 234 // Fold (con1-x)+con2 into (con1+con2)-x 235 if ( op1 == Op_AddI && op2 == Op_SubI ) { 236 // Swap edges to try optimizations below 237 in1 = in2; 238 in2 = in(1); 239 op1 = op2; 240 op2 = in2->Opcode(); 241 } 242 if( op1 == Op_SubI ) { 243 const Type *t_sub1 = phase->type( in1->in(1) ); 244 const Type *t_2 = phase->type( in2 ); 245 if( t_sub1->singleton() && t_2->singleton() && t_sub1 != Type::TOP && t_2 != Type::TOP ) 246 return new (phase->C, 3) SubINode(phase->makecon( add_ring( t_sub1, t_2 ) ), 247 in1->in(2) ); 248 // Convert "(a-b)+(c-d)" into "(a+c)-(b+d)" 249 if( op2 == Op_SubI ) { 250 // Check for dead cycle: d = (a-b)+(c-d) 251 assert( in1->in(2) != this && in2->in(2) != this, 252 "dead loop in AddINode::Ideal" ); 253 Node *sub = new (phase->C, 3) SubINode(NULL, NULL); 254 sub->init_req(1, phase->transform(new (phase->C, 3) AddINode(in1->in(1), in2->in(1) ) )); 255 sub->init_req(2, phase->transform(new (phase->C, 3) AddINode(in1->in(2), in2->in(2) ) )); 256 return sub; 257 } 258 // Convert "(a-b)+(b+c)" into "(a+c)" 259 if( op2 == Op_AddI && in1->in(2) == in2->in(1) ) { 260 assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddINode::Ideal"); 261 return new (phase->C, 3) AddINode(in1->in(1), in2->in(2)); 262 } 263 // Convert "(a-b)+(c+b)" into "(a+c)" 264 if( op2 == Op_AddI && in1->in(2) == in2->in(2) ) { 265 assert(in1->in(1) != this && in2->in(1) != this,"dead loop in AddINode::Ideal"); 266 return new (phase->C, 3) AddINode(in1->in(1), in2->in(1)); 267 } 268 // Convert "(a-b)+(b-c)" into "(a-c)" 269 if( op2 == Op_SubI && in1->in(2) == in2->in(1) ) { 270 assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddINode::Ideal"); 271 return new (phase->C, 3) SubINode(in1->in(1), in2->in(2)); 272 } 273 // Convert "(a-b)+(c-a)" into "(c-b)" 274 if( op2 == Op_SubI && in1->in(1) == in2->in(2) ) { 275 assert(in1->in(2) != this && in2->in(1) != this,"dead loop in AddINode::Ideal"); 276 return new (phase->C, 3) SubINode(in2->in(1), in1->in(2)); 277 } 278 } 279 280 // Convert "x+(0-y)" into "(x-y)" 281 if( op2 == Op_SubI && phase->type(in2->in(1)) == TypeInt::ZERO ) 282 return new (phase->C, 3) SubINode(in1, in2->in(2) ); 283 284 // Convert "(0-y)+x" into "(x-y)" 285 if( op1 == Op_SubI && phase->type(in1->in(1)) == TypeInt::ZERO ) 286 return new (phase->C, 3) SubINode( in2, in1->in(2) ); 287 288 // Convert (x>>>z)+y into (x+(y<<z))>>>z for small constant z and y. 289 // Helps with array allocation math constant folding 290 // See 4790063: 291 // Unrestricted transformation is unsafe for some runtime values of 'x' 292 // ( x == 0, z == 1, y == -1 ) fails 293 // ( x == -5, z == 1, y == 1 ) fails 294 // Transform works for small z and small negative y when the addition 295 // (x + (y << z)) does not cross zero. 296 // Implement support for negative y and (x >= -(y << z)) 297 // Have not observed cases where type information exists to support 298 // positive y and (x <= -(y << z)) 299 if( op1 == Op_URShiftI && op2 == Op_ConI && 300 in1->in(2)->Opcode() == Op_ConI ) { 301 jint z = phase->type( in1->in(2) )->is_int()->get_con() & 0x1f; // only least significant 5 bits matter 302 jint y = phase->type( in2 )->is_int()->get_con(); 303 304 if( z < 5 && -5 < y && y < 0 ) { 305 const Type *t_in11 = phase->type(in1->in(1)); 306 if( t_in11 != Type::TOP && (t_in11->is_int()->_lo >= -(y << z)) ) { 307 Node *a = phase->transform( new (phase->C, 3) AddINode( in1->in(1), phase->intcon(y<<z) ) ); 308 return new (phase->C, 3) URShiftINode( a, in1->in(2) ); 309 } 310 } 311 } 312 313 return AddNode::Ideal(phase, can_reshape); 314} 315 316 317//------------------------------Identity--------------------------------------- 318// Fold (x-y)+y OR y+(x-y) into x 319Node *AddINode::Identity( PhaseTransform *phase ) { 320 if( in(1)->Opcode() == Op_SubI && phase->eqv(in(1)->in(2),in(2)) ) { 321 return in(1)->in(1); 322 } 323 else if( in(2)->Opcode() == Op_SubI && phase->eqv(in(2)->in(2),in(1)) ) { 324 return in(2)->in(1); 325 } 326 return AddNode::Identity(phase); 327} 328 329 330//------------------------------add_ring--------------------------------------- 331// Supplied function returns the sum of the inputs. Guaranteed never 332// to be passed a TOP or BOTTOM type, these are filtered out by 333// pre-check. 334const Type *AddINode::add_ring( const Type *t0, const Type *t1 ) const { 335 const TypeInt *r0 = t0->is_int(); // Handy access 336 const TypeInt *r1 = t1->is_int(); 337 int lo = r0->_lo + r1->_lo; 338 int hi = r0->_hi + r1->_hi; 339 if( !(r0->is_con() && r1->is_con()) ) { 340 // Not both constants, compute approximate result 341 if( (r0->_lo & r1->_lo) < 0 && lo >= 0 ) { 342 lo = min_jint; hi = max_jint; // Underflow on the low side 343 } 344 if( (~(r0->_hi | r1->_hi)) < 0 && hi < 0 ) { 345 lo = min_jint; hi = max_jint; // Overflow on the high side 346 } 347 if( lo > hi ) { // Handle overflow 348 lo = min_jint; hi = max_jint; 349 } 350 } else { 351 // both constants, compute precise result using 'lo' and 'hi' 352 // Semantics define overflow and underflow for integer addition 353 // as expected. In particular: 0x80000000 + 0x80000000 --> 0x0 354 } 355 return TypeInt::make( lo, hi, MAX2(r0->_widen,r1->_widen) ); 356} 357 358 359//============================================================================= 360//------------------------------Idealize--------------------------------------- 361Node *AddLNode::Ideal(PhaseGVN *phase, bool can_reshape) { 362 Node* in1 = in(1); 363 Node* in2 = in(2); 364 int op1 = in1->Opcode(); 365 int op2 = in2->Opcode(); 366 // Fold (con1-x)+con2 into (con1+con2)-x 367 if ( op1 == Op_AddL && op2 == Op_SubL ) { 368 // Swap edges to try optimizations below 369 in1 = in2; 370 in2 = in(1); 371 op1 = op2; 372 op2 = in2->Opcode(); 373 } 374 // Fold (con1-x)+con2 into (con1+con2)-x 375 if( op1 == Op_SubL ) { 376 const Type *t_sub1 = phase->type( in1->in(1) ); 377 const Type *t_2 = phase->type( in2 ); 378 if( t_sub1->singleton() && t_2->singleton() && t_sub1 != Type::TOP && t_2 != Type::TOP ) 379 return new (phase->C, 3) SubLNode(phase->makecon( add_ring( t_sub1, t_2 ) ), 380 in1->in(2) ); 381 // Convert "(a-b)+(c-d)" into "(a+c)-(b+d)" 382 if( op2 == Op_SubL ) { 383 // Check for dead cycle: d = (a-b)+(c-d) 384 assert( in1->in(2) != this && in2->in(2) != this, 385 "dead loop in AddLNode::Ideal" ); 386 Node *sub = new (phase->C, 3) SubLNode(NULL, NULL); 387 sub->init_req(1, phase->transform(new (phase->C, 3) AddLNode(in1->in(1), in2->in(1) ) )); 388 sub->init_req(2, phase->transform(new (phase->C, 3) AddLNode(in1->in(2), in2->in(2) ) )); 389 return sub; 390 } 391 // Convert "(a-b)+(b+c)" into "(a+c)" 392 if( op2 == Op_AddL && in1->in(2) == in2->in(1) ) { 393 assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddLNode::Ideal"); 394 return new (phase->C, 3) AddLNode(in1->in(1), in2->in(2)); 395 } 396 // Convert "(a-b)+(c+b)" into "(a+c)" 397 if( op2 == Op_AddL && in1->in(2) == in2->in(2) ) { 398 assert(in1->in(1) != this && in2->in(1) != this,"dead loop in AddLNode::Ideal"); 399 return new (phase->C, 3) AddLNode(in1->in(1), in2->in(1)); 400 } 401 // Convert "(a-b)+(b-c)" into "(a-c)" 402 if( op2 == Op_SubL && in1->in(2) == in2->in(1) ) { 403 assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddLNode::Ideal"); 404 return new (phase->C, 3) SubLNode(in1->in(1), in2->in(2)); 405 } 406 // Convert "(a-b)+(c-a)" into "(c-b)" 407 if( op2 == Op_SubL && in1->in(1) == in1->in(2) ) { 408 assert(in1->in(2) != this && in2->in(1) != this,"dead loop in AddLNode::Ideal"); 409 return new (phase->C, 3) SubLNode(in2->in(1), in1->in(2)); 410 } 411 } 412 413 // Convert "x+(0-y)" into "(x-y)" 414 if( op2 == Op_SubL && phase->type(in2->in(1)) == TypeLong::ZERO ) 415 return new (phase->C, 3) SubLNode( in1, in2->in(2) ); 416 417 // Convert "(0-y)+x" into "(x-y)" 418 if( op1 == Op_SubL && phase->type(in1->in(1)) == TypeInt::ZERO ) 419 return new (phase->C, 3) SubLNode( in2, in1->in(2) ); 420 421 // Convert "X+X+X+X+X...+X+Y" into "k*X+Y" or really convert "X+(X+Y)" 422 // into "(X<<1)+Y" and let shift-folding happen. 423 if( op2 == Op_AddL && 424 in2->in(1) == in1 && 425 op1 != Op_ConL && 426 0 ) { 427 Node *shift = phase->transform(new (phase->C, 3) LShiftLNode(in1,phase->intcon(1))); 428 return new (phase->C, 3) AddLNode(shift,in2->in(2)); 429 } 430 431 return AddNode::Ideal(phase, can_reshape); 432} 433 434 435//------------------------------Identity--------------------------------------- 436// Fold (x-y)+y OR y+(x-y) into x 437Node *AddLNode::Identity( PhaseTransform *phase ) { 438 if( in(1)->Opcode() == Op_SubL && phase->eqv(in(1)->in(2),in(2)) ) { 439 return in(1)->in(1); 440 } 441 else if( in(2)->Opcode() == Op_SubL && phase->eqv(in(2)->in(2),in(1)) ) { 442 return in(2)->in(1); 443 } 444 return AddNode::Identity(phase); 445} 446 447 448//------------------------------add_ring--------------------------------------- 449// Supplied function returns the sum of the inputs. Guaranteed never 450// to be passed a TOP or BOTTOM type, these are filtered out by 451// pre-check. 452const Type *AddLNode::add_ring( const Type *t0, const Type *t1 ) const { 453 const TypeLong *r0 = t0->is_long(); // Handy access 454 const TypeLong *r1 = t1->is_long(); 455 jlong lo = r0->_lo + r1->_lo; 456 jlong hi = r0->_hi + r1->_hi; 457 if( !(r0->is_con() && r1->is_con()) ) { 458 // Not both constants, compute approximate result 459 if( (r0->_lo & r1->_lo) < 0 && lo >= 0 ) { 460 lo =min_jlong; hi = max_jlong; // Underflow on the low side 461 } 462 if( (~(r0->_hi | r1->_hi)) < 0 && hi < 0 ) { 463 lo = min_jlong; hi = max_jlong; // Overflow on the high side 464 } 465 if( lo > hi ) { // Handle overflow 466 lo = min_jlong; hi = max_jlong; 467 } 468 } else { 469 // both constants, compute precise result using 'lo' and 'hi' 470 // Semantics define overflow and underflow for integer addition 471 // as expected. In particular: 0x80000000 + 0x80000000 --> 0x0 472 } 473 return TypeLong::make( lo, hi, MAX2(r0->_widen,r1->_widen) ); 474} 475 476 477//============================================================================= 478//------------------------------add_of_identity-------------------------------- 479// Check for addition of the identity 480const Type *AddFNode::add_of_identity( const Type *t1, const Type *t2 ) const { 481 // x ADD 0 should return x unless 'x' is a -zero 482 // 483 // const Type *zero = add_id(); // The additive identity 484 // jfloat f1 = t1->getf(); 485 // jfloat f2 = t2->getf(); 486 // 487 // if( t1->higher_equal( zero ) ) return t2; 488 // if( t2->higher_equal( zero ) ) return t1; 489 490 return NULL; 491} 492 493//------------------------------add_ring--------------------------------------- 494// Supplied function returns the sum of the inputs. 495// This also type-checks the inputs for sanity. Guaranteed never to 496// be passed a TOP or BOTTOM type, these are filtered out by pre-check. 497const Type *AddFNode::add_ring( const Type *t0, const Type *t1 ) const { 498 // We must be adding 2 float constants. 499 return TypeF::make( t0->getf() + t1->getf() ); 500} 501 502//------------------------------Ideal------------------------------------------ 503Node *AddFNode::Ideal(PhaseGVN *phase, bool can_reshape) { 504 if( IdealizedNumerics && !phase->C->method()->is_strict() ) { 505 return AddNode::Ideal(phase, can_reshape); // commutative and associative transforms 506 } 507 508 // Floating point additions are not associative because of boundary conditions (infinity) 509 return commute(this, 510 phase->type( in(1) )->singleton(), 511 phase->type( in(2) )->singleton() ) ? this : NULL; 512} 513 514 515//============================================================================= 516//------------------------------add_of_identity-------------------------------- 517// Check for addition of the identity 518const Type *AddDNode::add_of_identity( const Type *t1, const Type *t2 ) const { 519 // x ADD 0 should return x unless 'x' is a -zero 520 // 521 // const Type *zero = add_id(); // The additive identity 522 // jfloat f1 = t1->getf(); 523 // jfloat f2 = t2->getf(); 524 // 525 // if( t1->higher_equal( zero ) ) return t2; 526 // if( t2->higher_equal( zero ) ) return t1; 527 528 return NULL; 529} 530//------------------------------add_ring--------------------------------------- 531// Supplied function returns the sum of the inputs. 532// This also type-checks the inputs for sanity. Guaranteed never to 533// be passed a TOP or BOTTOM type, these are filtered out by pre-check. 534const Type *AddDNode::add_ring( const Type *t0, const Type *t1 ) const { 535 // We must be adding 2 double constants. 536 return TypeD::make( t0->getd() + t1->getd() ); 537} 538 539//------------------------------Ideal------------------------------------------ 540Node *AddDNode::Ideal(PhaseGVN *phase, bool can_reshape) { 541 if( IdealizedNumerics && !phase->C->method()->is_strict() ) { 542 return AddNode::Ideal(phase, can_reshape); // commutative and associative transforms 543 } 544 545 // Floating point additions are not associative because of boundary conditions (infinity) 546 return commute(this, 547 phase->type( in(1) )->singleton(), 548 phase->type( in(2) )->singleton() ) ? this : NULL; 549} 550 551 552//============================================================================= 553//------------------------------Identity--------------------------------------- 554// If one input is a constant 0, return the other input. 555Node *AddPNode::Identity( PhaseTransform *phase ) { 556 return ( phase->type( in(Offset) )->higher_equal( TypeX_ZERO ) ) ? in(Address) : this; 557} 558 559//------------------------------Idealize--------------------------------------- 560Node *AddPNode::Ideal(PhaseGVN *phase, bool can_reshape) { 561 // Bail out if dead inputs 562 if( phase->type( in(Address) ) == Type::TOP ) return NULL; 563 564 // If the left input is an add of a constant, flatten the expression tree. 565 const Node *n = in(Address); 566 if (n->is_AddP() && n->in(Base) == in(Base)) { 567 const AddPNode *addp = n->as_AddP(); // Left input is an AddP 568 assert( !addp->in(Address)->is_AddP() || 569 addp->in(Address)->as_AddP() != addp, 570 "dead loop in AddPNode::Ideal" ); 571 // Type of left input's right input 572 const Type *t = phase->type( addp->in(Offset) ); 573 if( t == Type::TOP ) return NULL; 574 const TypeX *t12 = t->is_intptr_t(); 575 if( t12->is_con() ) { // Left input is an add of a constant? 576 // If the right input is a constant, combine constants 577 const Type *temp_t2 = phase->type( in(Offset) ); 578 if( temp_t2 == Type::TOP ) return NULL; 579 const TypeX *t2 = temp_t2->is_intptr_t(); 580 Node* address; 581 Node* offset; 582 if( t2->is_con() ) { 583 // The Add of the flattened expression 584 address = addp->in(Address); 585 offset = phase->MakeConX(t2->get_con() + t12->get_con()); 586 } else { 587 // Else move the constant to the right. ((A+con)+B) into ((A+B)+con) 588 address = phase->transform(new (phase->C, 4) AddPNode(in(Base),addp->in(Address),in(Offset))); 589 offset = addp->in(Offset); 590 } 591 PhaseIterGVN *igvn = phase->is_IterGVN(); 592 if( igvn ) { 593 set_req_X(Address,address,igvn); 594 set_req_X(Offset,offset,igvn); 595 } else { 596 set_req(Address,address); 597 set_req(Offset,offset); 598 } 599 return this; 600 } 601 } 602 603 // Raw pointers? 604 if( in(Base)->bottom_type() == Type::TOP ) { 605 // If this is a NULL+long form (from unsafe accesses), switch to a rawptr. 606 if (phase->type(in(Address)) == TypePtr::NULL_PTR) { 607 Node* offset = in(Offset); 608 return new (phase->C, 2) CastX2PNode(offset); 609 } 610 } 611 612 // If the right is an add of a constant, push the offset down. 613 // Convert: (ptr + (offset+con)) into (ptr+offset)+con. 614 // The idea is to merge array_base+scaled_index groups together, 615 // and only have different constant offsets from the same base. 616 const Node *add = in(Offset); 617 if( add->Opcode() == Op_AddX && add->in(1) != add ) { 618 const Type *t22 = phase->type( add->in(2) ); 619 if( t22->singleton() && (t22 != Type::TOP) ) { // Right input is an add of a constant? 620 set_req(Address, phase->transform(new (phase->C, 4) AddPNode(in(Base),in(Address),add->in(1)))); 621 set_req(Offset, add->in(2)); 622 return this; // Made progress 623 } 624 } 625 626 return NULL; // No progress 627} 628 629//------------------------------bottom_type------------------------------------ 630// Bottom-type is the pointer-type with unknown offset. 631const Type *AddPNode::bottom_type() const { 632 if (in(Address) == NULL) return TypePtr::BOTTOM; 633 const TypePtr *tp = in(Address)->bottom_type()->isa_ptr(); 634 if( !tp ) return Type::TOP; // TOP input means TOP output 635 assert( in(Offset)->Opcode() != Op_ConP, "" ); 636 const Type *t = in(Offset)->bottom_type(); 637 if( t == Type::TOP ) 638 return tp->add_offset(Type::OffsetTop); 639 const TypeX *tx = t->is_intptr_t(); 640 intptr_t txoffset = Type::OffsetBot; 641 if (tx->is_con()) { // Left input is an add of a constant? 642 txoffset = tx->get_con(); 643 } 644 return tp->add_offset(txoffset); 645} 646 647//------------------------------Value------------------------------------------ 648const Type *AddPNode::Value( PhaseTransform *phase ) const { 649 // Either input is TOP ==> the result is TOP 650 const Type *t1 = phase->type( in(Address) ); 651 const Type *t2 = phase->type( in(Offset) ); 652 if( t1 == Type::TOP ) return Type::TOP; 653 if( t2 == Type::TOP ) return Type::TOP; 654 655 // Left input is a pointer 656 const TypePtr *p1 = t1->isa_ptr(); 657 // Right input is an int 658 const TypeX *p2 = t2->is_intptr_t(); 659 // Add 'em 660 intptr_t p2offset = Type::OffsetBot; 661 if (p2->is_con()) { // Left input is an add of a constant? 662 p2offset = p2->get_con(); 663 } 664 return p1->add_offset(p2offset); 665} 666 667//------------------------Ideal_base_and_offset-------------------------------- 668// Split an oop pointer into a base and offset. 669// (The offset might be Type::OffsetBot in the case of an array.) 670// Return the base, or NULL if failure. 671Node* AddPNode::Ideal_base_and_offset(Node* ptr, PhaseTransform* phase, 672 // second return value: 673 intptr_t& offset) { 674 if (ptr->is_AddP()) { 675 Node* base = ptr->in(AddPNode::Base); 676 Node* addr = ptr->in(AddPNode::Address); 677 Node* offs = ptr->in(AddPNode::Offset); 678 if (base == addr || base->is_top()) { 679 offset = phase->find_intptr_t_con(offs, Type::OffsetBot); 680 if (offset != Type::OffsetBot) { 681 return addr; 682 } 683 } 684 } 685 offset = Type::OffsetBot; 686 return NULL; 687} 688 689//------------------------------unpack_offsets---------------------------------- 690// Collect the AddP offset values into the elements array, giving up 691// if there are more than length. 692int AddPNode::unpack_offsets(Node* elements[], int length) { 693 int count = 0; 694 Node* addr = this; 695 Node* base = addr->in(AddPNode::Base); 696 while (addr->is_AddP()) { 697 if (addr->in(AddPNode::Base) != base) { 698 // give up 699 return -1; 700 } 701 elements[count++] = addr->in(AddPNode::Offset); 702 if (count == length) { 703 // give up 704 return -1; 705 } 706 addr = addr->in(AddPNode::Address); 707 } 708 return count; 709} 710 711//------------------------------match_edge------------------------------------- 712// Do we Match on this edge index or not? Do not match base pointer edge 713uint AddPNode::match_edge(uint idx) const { 714 return idx > Base; 715} 716 717//============================================================================= 718//------------------------------Identity--------------------------------------- 719Node *OrINode::Identity( PhaseTransform *phase ) { 720 // x | x => x 721 if (phase->eqv(in(1), in(2))) { 722 return in(1); 723 } 724 725 return AddNode::Identity(phase); 726} 727 728//------------------------------add_ring--------------------------------------- 729// Supplied function returns the sum of the inputs IN THE CURRENT RING. For 730// the logical operations the ring's ADD is really a logical OR function. 731// This also type-checks the inputs for sanity. Guaranteed never to 732// be passed a TOP or BOTTOM type, these are filtered out by pre-check. 733const Type *OrINode::add_ring( const Type *t0, const Type *t1 ) const { 734 const TypeInt *r0 = t0->is_int(); // Handy access 735 const TypeInt *r1 = t1->is_int(); 736 737 // If both args are bool, can figure out better types 738 if ( r0 == TypeInt::BOOL ) { 739 if ( r1 == TypeInt::ONE) { 740 return TypeInt::ONE; 741 } else if ( r1 == TypeInt::BOOL ) { 742 return TypeInt::BOOL; 743 } 744 } else if ( r0 == TypeInt::ONE ) { 745 if ( r1 == TypeInt::BOOL ) { 746 return TypeInt::ONE; 747 } 748 } 749 750 // If either input is not a constant, just return all integers. 751 if( !r0->is_con() || !r1->is_con() ) 752 return TypeInt::INT; // Any integer, but still no symbols. 753 754 // Otherwise just OR them bits. 755 return TypeInt::make( r0->get_con() | r1->get_con() ); 756} 757 758//============================================================================= 759//------------------------------Identity--------------------------------------- 760Node *OrLNode::Identity( PhaseTransform *phase ) { 761 // x | x => x 762 if (phase->eqv(in(1), in(2))) { 763 return in(1); 764 } 765 766 return AddNode::Identity(phase); 767} 768 769//------------------------------add_ring--------------------------------------- 770const Type *OrLNode::add_ring( const Type *t0, const Type *t1 ) const { 771 const TypeLong *r0 = t0->is_long(); // Handy access 772 const TypeLong *r1 = t1->is_long(); 773 774 // If either input is not a constant, just return all integers. 775 if( !r0->is_con() || !r1->is_con() ) 776 return TypeLong::LONG; // Any integer, but still no symbols. 777 778 // Otherwise just OR them bits. 779 return TypeLong::make( r0->get_con() | r1->get_con() ); 780} 781 782//============================================================================= 783//------------------------------add_ring--------------------------------------- 784// Supplied function returns the sum of the inputs IN THE CURRENT RING. For 785// the logical operations the ring's ADD is really a logical OR function. 786// This also type-checks the inputs for sanity. Guaranteed never to 787// be passed a TOP or BOTTOM type, these are filtered out by pre-check. 788const Type *XorINode::add_ring( const Type *t0, const Type *t1 ) const { 789 const TypeInt *r0 = t0->is_int(); // Handy access 790 const TypeInt *r1 = t1->is_int(); 791 792 // Complementing a boolean? 793 if( r0 == TypeInt::BOOL && ( r1 == TypeInt::ONE 794 || r1 == TypeInt::BOOL)) 795 return TypeInt::BOOL; 796 797 if( !r0->is_con() || !r1->is_con() ) // Not constants 798 return TypeInt::INT; // Any integer, but still no symbols. 799 800 // Otherwise just XOR them bits. 801 return TypeInt::make( r0->get_con() ^ r1->get_con() ); 802} 803 804//============================================================================= 805//------------------------------add_ring--------------------------------------- 806const Type *XorLNode::add_ring( const Type *t0, const Type *t1 ) const { 807 const TypeLong *r0 = t0->is_long(); // Handy access 808 const TypeLong *r1 = t1->is_long(); 809 810 // If either input is not a constant, just return all integers. 811 if( !r0->is_con() || !r1->is_con() ) 812 return TypeLong::LONG; // Any integer, but still no symbols. 813 814 // Otherwise just OR them bits. 815 return TypeLong::make( r0->get_con() ^ r1->get_con() ); 816} 817 818//============================================================================= 819//------------------------------add_ring--------------------------------------- 820// Supplied function returns the sum of the inputs. 821const Type *MaxINode::add_ring( const Type *t0, const Type *t1 ) const { 822 const TypeInt *r0 = t0->is_int(); // Handy access 823 const TypeInt *r1 = t1->is_int(); 824 825 // Otherwise just MAX them bits. 826 return TypeInt::make( MAX2(r0->_lo,r1->_lo), MAX2(r0->_hi,r1->_hi), MAX2(r0->_widen,r1->_widen) ); 827} 828 829//============================================================================= 830//------------------------------Idealize--------------------------------------- 831// MINs show up in range-check loop limit calculations. Look for 832// "MIN2(x+c0,MIN2(y,x+c1))". Pick the smaller constant: "MIN2(x+c0,y)" 833Node *MinINode::Ideal(PhaseGVN *phase, bool can_reshape) { 834 Node *progress = NULL; 835 // Force a right-spline graph 836 Node *l = in(1); 837 Node *r = in(2); 838 // Transform MinI1( MinI2(a,b), c) into MinI1( a, MinI2(b,c) ) 839 // to force a right-spline graph for the rest of MinINode::Ideal(). 840 if( l->Opcode() == Op_MinI ) { 841 assert( l != l->in(1), "dead loop in MinINode::Ideal" ); 842 r = phase->transform(new (phase->C, 3) MinINode(l->in(2),r)); 843 l = l->in(1); 844 set_req(1, l); 845 set_req(2, r); 846 return this; 847 } 848 849 // Get left input & constant 850 Node *x = l; 851 int x_off = 0; 852 if( x->Opcode() == Op_AddI && // Check for "x+c0" and collect constant 853 x->in(2)->is_Con() ) { 854 const Type *t = x->in(2)->bottom_type(); 855 if( t == Type::TOP ) return NULL; // No progress 856 x_off = t->is_int()->get_con(); 857 x = x->in(1); 858 } 859 860 // Scan a right-spline-tree for MINs 861 Node *y = r; 862 int y_off = 0; 863 // Check final part of MIN tree 864 if( y->Opcode() == Op_AddI && // Check for "y+c1" and collect constant 865 y->in(2)->is_Con() ) { 866 const Type *t = y->in(2)->bottom_type(); 867 if( t == Type::TOP ) return NULL; // No progress 868 y_off = t->is_int()->get_con(); 869 y = y->in(1); 870 } 871 if( x->_idx > y->_idx && r->Opcode() != Op_MinI ) { 872 swap_edges(1, 2); 873 return this; 874 } 875 876 877 if( r->Opcode() == Op_MinI ) { 878 assert( r != r->in(2), "dead loop in MinINode::Ideal" ); 879 y = r->in(1); 880 // Check final part of MIN tree 881 if( y->Opcode() == Op_AddI &&// Check for "y+c1" and collect constant 882 y->in(2)->is_Con() ) { 883 const Type *t = y->in(2)->bottom_type(); 884 if( t == Type::TOP ) return NULL; // No progress 885 y_off = t->is_int()->get_con(); 886 y = y->in(1); 887 } 888 889 if( x->_idx > y->_idx ) 890 return new (phase->C, 3) MinINode(r->in(1),phase->transform(new (phase->C, 3) MinINode(l,r->in(2)))); 891 892 // See if covers: MIN2(x+c0,MIN2(y+c1,z)) 893 if( !phase->eqv(x,y) ) return NULL; 894 // If (y == x) transform MIN2(x+c0, MIN2(x+c1,z)) into 895 // MIN2(x+c0 or x+c1 which less, z). 896 return new (phase->C, 3) MinINode(phase->transform(new (phase->C, 3) AddINode(x,phase->intcon(MIN2(x_off,y_off)))),r->in(2)); 897 } else { 898 // See if covers: MIN2(x+c0,y+c1) 899 if( !phase->eqv(x,y) ) return NULL; 900 // If (y == x) transform MIN2(x+c0,x+c1) into x+c0 or x+c1 which less. 901 return new (phase->C, 3) AddINode(x,phase->intcon(MIN2(x_off,y_off))); 902 } 903 904} 905 906//------------------------------add_ring--------------------------------------- 907// Supplied function returns the sum of the inputs. 908const Type *MinINode::add_ring( const Type *t0, const Type *t1 ) const { 909 const TypeInt *r0 = t0->is_int(); // Handy access 910 const TypeInt *r1 = t1->is_int(); 911 912 // Otherwise just MIN them bits. 913 return TypeInt::make( MIN2(r0->_lo,r1->_lo), MIN2(r0->_hi,r1->_hi), MAX2(r0->_widen,r1->_widen) ); 914} 915